Mayenite supported perovskite monoliths for catalytic combustion of methyl methacrylate

Abstract

To improve their thermal stability, La_0.8Sr_0.2MnO₃ cordierite monoliths are washcoated with mayenite, which is a novel Al-based material with the crystal structure of 12MO·7Al₂O₃ (M= Ca, Sr). The monoliths are characterized by means of nitrogen adsorption/desorption, scanning electron microscopy, and X-ray diffraction. Catalytic performances of the monoliths are tested for methyl methacrylate combustion. The results show that mayenite obviously improves both the physic-chemical properties and the catalytic performance of the monoliths. Because mayenite improves the dispersity of La_0.8Sr_0.2MnO₃ and also prevents the interaction between La_0.8Sr_0.2MnO₃ and cordierite or γ-Al₂O₃, both crystal structure and surface morphology of La_0.8Sr_0.2MnO₃ phase can thereby be stable on the mayenite surface even at high temperature up to 1050 ºC. Under the given reaction conditions, La_0.8Sr_0.2MnO₃ monolith washcoated with 12SrO·7Al₂O₃ shows the best catalytic activity for methyl methacrylate combustion among all the tested monoliths.

Key words： mayenite; perovskite; catalytic combustion; methyl methacrylate; monolith

Acknowledgments

We would like to acknowledge the financial support of the Natural Science Foundation of China (Grant No. 20903080).

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